Why Haven’t We Visited By Aliens Yet?为什么没有我们走访了外国人，但？

It is probable (but not definite) that civilizations evolve at different rates.这是可能的（但并非一定）文明演变在不同的利率。 The hominid species spent a good million years just running around like an animal before we developed the mutation that allows us to imagine the future and make decisions that are not instinctual.该原始人种，花了好几年万只跑一样，动物之前，我们开发了突变，使我们能够想象未来和作出决定，不属于本能。 So, even if civilizations were to develop on many different planets, they could be seperated in TIME by a few million years easily.因此，即使文明的发展在许多不同的行星，它们可以分离的时间由数百万年容易。

On top of that, before you send out an expedition to a planet in search of life, you’d want to receive a signal from them.最重要的是，之前您发送了一个远征到一个星球上寻找生命，您想要收到一个信号，从他们。 We’ve only been broadcasting into space for some 40 years now… and 40 light-years is pretty small in the grand scheme of things.我们只被广播到空间，大约40年，现在… …和40光年年是相当小在大计划中的事情。 Even if another civilization received our signals today, it would take them 40 years minimum to respond, barring some faster-than-light communication technology, and probably much longer to actually get here.即使另一文明收到我们的信号，今天，它将采取他们40年来的最低回应，除非有一些更快，比光通信技术，并可能时间要长得多，其实来到这里。 With our current rocket technology (~40 miles/sec exiting Earth’s sphere of influence), it would take us a good 4500 years just to get 1 light-year away.与我们目前的火箭技术（ 〜 40英里/秒驶出地球的势力范围） ，它将采取我们一个很好的四千五百年只是为了获得一轻年消失。 I think the nearest star is about 4 light years away – so that’sa long time!我认为最近的明星是约4光年的距离-使t hat'sa长的时间！

Intelligent life is most likely out there somewhere (or were, or will be), but I doubt we’ll run across one anytime soon.智能生命是最有可能有某个（或人，或将要） ，但我怀疑我们会遇到一个随时很快。 The distances and times are too great.距离和时间是太大。 However, unintelligent aliens (microbes, or maybe sea-creatures) we might find in the next 100-200 years on the various moons and planets in our solar system.不过，愚蠢的外国人（微生物，或者，海生物） ，我们可能会发现，在未来100-200年，对各种卫星和行星在我们的太阳系。

Via通过 Google Blogoscoped在Google blogoscoped

Tags:标签： Aliens外国人 , ， Crop作物 , ， Crop Circle作物圈 , ， ET等 , ， Life Beyond Earth地球以外的生命 , ， Visited by Aliens访问的外国人

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